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SQL Server 效能

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在多月臺階層中，Configuration Manager使用SQL Server複寫在月臺之間傳輸資料。 如需詳細資訊，請參閱 資料庫複寫。

使用下圖開始針對可能影響複寫狀態的SQL Server效能進行疑難排解：

針對SQL Server效能進行疑難排解的圖表

查詢

此圖表使用下列查詢：

確定SQL Server清除變更追蹤資料表

DECLARE @RetentionUnit INT = 0;
DECLARE @RetentionPeriod INT = 0;
DECLARE @CTCutOffTime DATETIME;
DECLARE @CTMinTime DATETIME;

SELECT @RetentionPeriod=retention_period,  
    @RetentionUnit=retention_period_units  
FROM sys.change_tracking_databases  
WHERE database_id = DB_ID();

IF @RetentionUnit = 1
    SET @CTCutOffTime = DATEADD(MINUTE,-@RetentionPeriod,GETUTCDATE())
ELSE IF @RetentionUnit = 2
    SET @CTCutOffTime = DATEADD(HOUR,-@RetentionPeriod,GETUTCDATE())
ELSE IF @RetentionUnit = 3
    SET @CTCutOffTime = DATEADD(DAY,-@RetentionPeriod,GETUTCDATE())

-- give a buffer of two days
SET @CTCutOffTime = DATEADD(DAY, -2, @CTCutOffTime)
select top 1 @CTMinTime=commit_time from sys.dm_tran_commit_table order by commit_ts asc
IF @CTMinTime < @CTCutOffTime
    PRINT 'there is change tracking backlog, please contact Microsoft support'

變更目前處理 service Broker 訊息SQL Server會話遭到封鎖

select
       req.session_id
       ,req.blocking_session_id
       ,req.last_wait_type
       ,req.wait_type
       ,req.wait_resource
       ,t.text
from sys.dm_exec_sessions s
inner join sys.dm_exec_requests req on s.Session_id=req.session_id
cross apply sys.dm_exec_sql_text(sql_handle) t
where program_name='SMS_data_replication_service'

檢查詢問太多記憶體的會話

SELECT * FROM sys.dm_exec_query_memory_grants
ORDER BY requested_memory_kb DESC

檢查接受太多鎖定的會話

SELECT TOP 10 request_session_id,
program_name = (SELECT program_name FROM sys.dm_exec_sessions WHERE session_id=request_session_id),
COUNT (*) num_locks
FROM sys.dm_tran_locks
GROUP BY request_session_id
ORDER BY count (*) DESC

另請參閱

SQL Server 設定